Direct Answer
ISP proxies (also called static residential) are IP addresses registered to a home ISP but hosted on datacenter servers — fast, stable and single-IP. Mobile proxies use real 4G/5G carrier IPs shared via CGNAT. The key difference is trust: ISP IPs read as residential but live in datacenters, while mobile IPs carry the highest baseline trust of any proxy type.
What Is an ISP Proxy?
An ISP proxy — marketed as "static residential" — is an IP address that an internet service provider has registered, but which runs on a datacenter server rather than in an actual home. When a website checks the IP against a geolocation database, it sees an ISP name and a residential label. You get the stability and speed of a datacenter with the residential appearance of a home IP, and the IP stays the same (static).
That combination makes ISP proxies popular for tasks needing a steady identity — but the IP still originates from a hosting facility, which sophisticated platforms can factor in.
What Is a Mobile Proxy?
A mobile proxy routes through a real 4G/5G mobile connection on a real device. Because carriers share each public IP among thousands of genuine subscribers through CGNAT (Carrier-Grade NAT), one mobile IP represents a crowd of real users. A platform can't safely treat it as a single automated visitor without risking many legitimate people — which is why mobile IPs carry the highest baseline trust of any proxy type. The mechanics are explained in what is CGNAT.
ISP vs Mobile — Side by Side
| ISP (Static Residential) | Mobile (4G/5G) | |
|---|---|---|
| IP source | ISP-registered, datacenter-hosted | Real carrier network, real devices |
| Appearance | Residential ISP label | Mobile carrier (CGNAT) |
| Baseline trust | High | Highest |
| IP stability | Static (same IP) | Sticky session or rotation on demand |
| Speed | Very fast (datacenter-grade) | Real mobile speed |
| Best for | Steady identity on moderate targets | Strict targets, region-true mobile data |
Which Should You Choose?
Work from your target backwards:
- You need a fast, unchanging IP for a moderate target → an ISP proxy can be a good fit, and is usually cheaper.
- Your target is strict, blocks datacenter-adjacent ranges, or you need authentic German mobile data → a mobile proxy is the more reliable choice, because its trust comes from the carrier network itself, not just a label.
ISP proxies aren't "worse" — they're a different trade-off. They win on raw speed and price; mobile wins on trust against demanding platforms. For the full three-way picture including datacenter and rotating-residential, see mobile vs residential vs datacenter proxy.
Why Trust Differs
Both types can show a non-datacenter label, but the source is what holds up under scrutiny. An ISP IP is real in name yet sits in a server rack; a mobile IP is genuinely on a carrier network, mixed with thousands of real users. When a platform weighs how much caution to apply, that genuine shared-user nature is what gives mobile the edge — explained further in what IP reputation is.
FAQ
Is an ISP proxy the same as a residential proxy?
Not quite. A rotating residential proxy routes through real home connections; an ISP proxy uses ISP-registered IPs hosted in a datacenter. Both look residential, but they're sourced very differently.
Are ISP proxies faster than mobile proxies?
Usually yes — they run on datacenter infrastructure, so raw speed is high. Mobile proxies trade some speed for the highest baseline trust.
Which gives the most authentic German data?
A real German mobile IP, because it reflects exactly what a German mobile user experiences — the search results, ads and prices served on a German carrier network.
CTA
Need the highest-trust option for strict German targets? Browse real German mobile proxies at GermanProxy.io — dedicated or shared, fair-use 20 GB/day.
Get a German mobile proxy: Real 4G/5G IPs from Germany, fair-use 20 GB/day — see German 4G/5G mobile proxy options or try a shared 5G German proxy.